Beta-quartz glass ceramics and related precursor glasses

摘要

β-quartz glass-ceramics, the composition of which is most particularly optimized, with reference to the refining of their precursor glasses, with reference to good resistance to devitrification of said precursor glasses and with reference to their resistance to temperature ageing, articles comprising such glass-ceramics, lithium alumino-silicate glasses, which are precursors of such glass-ceramics, as well as methods for preparing such glass-ceramics and articles.

主权项

1. A glass-ceramic containing a β-quartz solid solution as a main crystalline phase, wherein its composition, expressed in percentages by weight of oxides, is free of CeO2, MnO2, F, Br, arsenic oxide and antimony oxide except for inevitable traces, and comprises, for at least 98% of its weight:SiO266-70Al2O3  18-<20Li2O3-4MgO0.5-1.5ZnO  1-2.2TiO22.5-3.2ZrO21.2-1.8SnO2 0.2-0.45BaO1-3SrO0-2BaO + SrO1-3CaO    0-<0.3Na2O    0-<0.3K2O    0-<0.3Na2O + K2O + CaO    0-<0.6P2O50-2Fe2O3  0-0.12at least one dye 0-2.